Another infrastructure of early Rochefort from 1766 was its bagne, a high-security penal colony involving hard labor. Bagnes were then common fixtures in military harbors and naval bases, such as Toulon or Brest, because they provided free labor. During the Jacobin period of the French Revolution (1790–95), over 800 Roman Catholicpriests and other clergy who refused to take the anti-Papal oath of the "Civil Constitution of the Clergy" were put aboard a fleet of prison ships in Rochefort harbor, where most died due to inhumane conditions. This was, in effect, one of the first "concentration camps" in the world.

Rochefort is a notable example of 17th-century "ville nouvelle" or new town, which means its design and building resulted from a political decree. The reason for building Rochefort was to a large extent that royal power could hardly depend on rebellious ProtestantLa Rochelle, which Cardinal Richelieu had to besiege a few decades earlier. Well into the 20th century, Rochefort remained primarily a garrison town. The tourist industry, which had long existed due to the town's spa, gained emphasis in the 1990s.